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Blockboard | 18mm

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Blockboard | 18mm

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Blockboard Sheets

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Blockboard is a panel consisting of a core of wooden strips between two layers of plywood. Our Blockboard has quality B/BB grade Hardwood Plywood faces on both sides, this means that the panels have minimal knots and defects, providing a smooth surface on the panel. Blockboard is considered to have more structural integrity and resilience than other panels such as Plywood and MDF, with chances of warping and cracking greatly reduced with the use of Blockboard. Blockboard is one of the strongest sheet materials we stock here at Builders Marketplace.

Due to the resin used to create the Blockboard we supply, it is not suitable for outdoor use. However, due to its softwood core, when Blockboard is used for interior projects it is highly versatile and customisable. These panels can be cut and adapts to most machinery, while the board can also be edged with softwood, veneered or painted. These qualities combined make Blockboard a perfect choice for a project such as an interior door, with its adaptability to customisation along with the material being a poor conductor of heat and sound.

Blockboard has a thickness of 18mm and is available in a variety of sizes:

Standard Sheet Sizes:

2400mm – 2440mm x 1200mm – 1220mm (8ft x 4ft)
1200mm – 1220mm x 1200mm – 1220mm (4ft x 4ft)
1200mm – 1220mm x 595mm – 610mm (4ft x 2ft)
595mm – 610mm x 595mm – 610mm (2ft x 2ft)
595mm – 610mm x 295mm – 310mm (2ft x 1ft)

Additional information

Weight N/A
Dimensions N/A
Sheet Size

2ft x 1ft, 2ft x 2ft, 4ft x 4ft, 4ft x 2ft, 8ft x 4ft

Sheet Thickness


Sheet Type


A Blockboard door is a type of door that is solid all the way through.

Blockboard is classified as plywood because it has at least 3 veneers.

Blockboard is a sandwich of hardwood and softwood. The core is made from strips of softwood and the rest is made with a hardwood veneer to make it lightweight and durable.

Blockboard is very strong is holds the screws in very well compared to other materials.

It’s lightweight, easy to carry, can be used for most things, environmentally friendly, corrosion-resistant and highly durable.

Blockboard is light in weight and is weaker than other materials.

This variety of blockboards used for outside use is called BWP boiling waterproof or BWR boiling water-resistant. The adhesives used makes it very resistant to moisture.

Blockboard can be used for a variety of things such as doors, worktops, shelves, partitions and panelling.